Major hazards monograph: Sulphur trioxide, oleum and sulphuric acid mist

1997 ◽  
Vol 53 (1-3) ◽  
pp. 235-236
Author(s):  
C. Nussey
Keyword(s):  
Sulphuric Acid ◽  
Acid Mist ◽  
Sulphur Trioxide

RAMAN SPECTRA OF THE H2SO4–SO3 AND D2SO4–SO3 SYSTEMS: EVIDENCE FOR THE OCCURRENCE OF POLYSULPHURIC ACIDS

1962 ◽  
Vol 40 (4) ◽  
pp. 658-674 ◽  
Author(s):  
R. J. Gillespie ◽  
E. A. Robinson
Keyword(s):  
Sulphuric Acid ◽  
Raman Spectra ◽  
Ionic Species ◽  
The Self ◽  
Experimental Results ◽  
Similar Work ◽  
Stretching Vibrations ◽  
Sulphur Trioxide ◽  
High Concentrations

The Raman spectra of oleums, i.e. mixtures of sulphur trioxide and sulphuric acid, have been re-examined. Similar measurements on the sulphur trioxide – deuterosulphuric acid (D2SO4) system are also reported. The experimental results and conclusions of previous similar work on oleums are discussed. By comparison of the spectra of oleums with those of the polysulphuryl halides it is shown that the polysulphuric acids H2S2O7 and H2S3O10 are present in this system. The increase in the frequency of the SO2 stretching vibrations with increasing concentration of sulphur trioxide gives evidence for the existence of higher polysulphuric acids such as H2S4O13 at high concentrations of sulphur trioxide. In relatively concentrated oleum, sulphur trioxide monomer and trimer are also present. It is shown that the self-dissociation of liquid H2S2O7 gives mainly molecular H2S2O10 and H2SO4 and not ionic species. The conclusions reached from the interpretation of the Raman spectra of the D2SO4–SO3 system are similar to those arrived at for sulphuric acid oleums. The spectra of solutions of NaHSO4 in oleums were also examined, and are discussed.

Effects of sulphuric acid mist on plant canopies.

1979 ◽  
Vol 13 (7) ◽  
pp. 875-878
Author(s):  
James B. Wedding ◽  
Michael Ligotke ◽  
F. Dana Hess
Keyword(s):  
Sulphuric Acid ◽  
Plant Canopies ◽  
Acid Mist

THE SULPHURIC ACID SOLVENT SYSTEM: PART VI. THE BASICITIES OF COMPOUNDS CONTAINING SULPHUR–OXYGEN BONDS

1964 ◽  
Vol 42 (5) ◽  
pp. 1113-1122 ◽  
Author(s):  
S. K. Hall ◽  
E. A. Robinson
Keyword(s):  
Nitrogen Atom ◽  
Sulphuric Acid ◽  
Solvent System ◽  
Dimethyl Sulphoxide ◽  
Strong Base ◽  
Weak Bases ◽  
System Part ◽  
Sulphur Trioxide ◽  
Basic Behavior

Cryoscopic and conductimetric studies of a variety of compounds containing S—O bonds have shown that dimethyl sulphoxide behaves as a strong base in sulphuric acid whereas dialkyl sulphones behave as weak bases. In contrast diaryl sulphones and aryl sulphonic acids behave as non-electrolytes.A correlation is established between the basicities of the alkyl sulphones, H2SO4, and the HSO4− ion, and their sulphur–oxygen stretching frequencies. This relation is used to predict the basicities of other compounds containing S—O bonds. In particular it is shown that the basicity of monomeric sulphur trioxide is similar to that of sulphuric acid, and sulphamide is shown to behave as a strong base in sulphuric acid, which implies protonation on a nitrogen atom rather than on oxygen, since the S—O stretching frequencies indicate only weakly basic behavior for O-protonation.

THE SULPHURIC ACID SOLVENT SYSTEM: PART IV. SULPHATOCOMPOUNDS OF ARSENIC (III)

1963 ◽  
Vol 41 (2) ◽  
pp. 450-459 ◽  
Author(s):  
R. J. Gillespie ◽  
E. A. Robinson
Keyword(s):  
Sulphuric Acid ◽  
Solvent System ◽  
Dilute Solutions ◽  
Polymeric Compound ◽  
Polymeric Species ◽  
System Part ◽  
Hydrogen Sulphate ◽  
Sulphur Trioxide

The cryoscopic and conductimetric behavior of arsenic (III) oxide in 100% sulphuric acid and in dilute oleum have been investigated. It is concluded that in very dilute solutions in 100% sulphuric acid, arsenic (III) oxide forms arsonyl (III) hydrogen sulphate, AsO.HSO4, which is partly ionized to give the AsO+ cation. Both these species probably exist mainly in solvated forms, e.g., As(OH)(SO4H)2, and As(OH)(SO4H)+ respectively. At higher concentrations polymeric species such as HO.As(HSO4)OAs(HSO4)2 are present in increasing amounts and eventually the insoluble polymeric compound [(AsO)2SO4]n separates from solution. In oleum the more sulphated species As(HSO4)3, [(HSO4)2As]2O, and [(HSO4)2As]2SO4 are formed. Related structures are proposed for some previously prepared compounds of arsenic (III) oxide and sulphur trioxide.

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